JP2006338012A - Organic electroluminescent device and fabrication method thereof - Google Patents

Organic electroluminescent device and fabrication method thereof Download PDF

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JP2006338012A
JP2006338012A JP2006148857A JP2006148857A JP2006338012A JP 2006338012 A JP2006338012 A JP 2006338012A JP 2006148857 A JP2006148857 A JP 2006148857A JP 2006148857 A JP2006148857 A JP 2006148857A JP 2006338012 A JP2006338012 A JP 2006338012A
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light emitting
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pixel
organic electroluminescent
electrode
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JP4688732B2 (en
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Soon Kwang Hong
スンクヮン・ホン
Jae Woon Chang
チェウォン・チャン
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LG Display Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/352—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels the areas of the RGB subpixels being different
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/32—Stacked devices having two or more layers, each emitting at different wavelengths

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Manufacturing & Machinery (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Thin Film Transistor (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic electroluminescent device providing a natural image and a fabrication method thereof. <P>SOLUTION: The organic electroluminescent device includes gate wiring and data wiring defining red, green and blue unit pixels intersected with each other on a substrate; a non-light emitting region formed in each of the unit pixel a switching element constituted of a thin-film transistor including a gate electrode, active electrode, source electrode, and drain electrode, and a driving element; and a light emitting region formed in each of the unit pixels and including a pixel electrode contacting the drain electrode of the active element, wherein locations of at least two of of the non-light emitting regions are formed in the positions different from each other with respect to the corresponding unit pixels. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、画質を向上させると共に、価格競争力を高める有機電界発光素子及びその製造方法に関する。   The present invention relates to an organic electroluminescent device that improves image quality and price competitiveness, and a method for manufacturing the same.

一般に、有機電界発光素子(Organic Electro Luminescent Display：ＯＥＬＤ)とは、電子注入電極と正孔注入電極からそれぞれ電子と正孔を発光層内部に注入して、注入された電子と正孔が結合したエキシトンが励起状態から基底状態に落ちるとき発光する素子である。   In general, an organic electroluminescent display (OELD) is formed by injecting electrons and holes into an emission layer from an electron injection electrode and a hole injection electrode, respectively, and the injected electrons and holes are combined. It is an element that emits light when exciton falls from the excited state to the ground state.

このような原理により、従来の液晶表示素子(Liquid Crystal Display：ＬＣＤ)とは違って、有機電界発光素子には別途の光源を必要としないので、素子の体積と重量を低減できるという長所がある。   Due to such a principle, unlike a conventional liquid crystal display (LCD), the organic electroluminescent device does not require a separate light source, so that the volume and weight of the device can be reduced. .

また、有機電界発光素子は、高品位パネル特性、すなわち低電力、高輝度、高反応速度、低重量を有している。このような特性のため、有機電界発光素子は、移動通信端末機、ＣＨＳ、ＰＤＡ、カムコーダ、パーム(Parm)ＰＣなど、殆どの電子応用製品に使用できる、強力な次世代ディスプレイとされている。   The organic electroluminescent element has high-quality panel characteristics, that is, low power, high luminance, high reaction speed, and low weight. Due to these characteristics, the organic electroluminescent device is regarded as a powerful next-generation display that can be used in almost all electronic application products such as mobile communication terminals, CHS, PDAs, camcorders, and Palm PCs.

さらに、製造工程が単純なので、既存のＬＣＤより、生産原価を大幅に低減できるという長所がある。   Furthermore, since the manufacturing process is simple, there is an advantage that the production cost can be significantly reduced compared with the existing LCD.

このような有機電界発光素子を駆動する方式として、単純マトリックスタイプ(passive matrix type)と、アクティブマトリックスタイプ(active matrix type)とんじ分けられる。   As a method of driving such an organic electroluminescent element, there are a simple matrix type (passive matrix type) and an active matrix type.

前記単純マトリックスタイプ有機電界発光素子は、その構成が単純なことから、製造方法も単純であるが、消費電力が高く、表示素子の大面積化に困難があり、配線の数が増加すればするほど開口率が低下するという短所がある。   Since the simple matrix type organic electroluminescent device has a simple configuration, the manufacturing method is also simple. However, the power consumption is high, it is difficult to increase the area of the display device, and the number of wirings is increased. There is a disadvantage that the aperture ratio decreases.

反面、アクティブマトリックスタイプ有機電界発光素子は、高い発光効率と高画質が提供できるという長所がある。   On the other hand, the active matrix type organic electroluminescent device has an advantage that it can provide high luminous efficiency and high image quality.

図１は、従来の有機電界発光素子の構成を概略的に図示した図面である。
図示されたように、有機電界発光素子１０は、透明な第１基板１２の上部に薄膜トランジスタアレイ部１４が備えられ、前記薄膜トランジスタアレイ部１４の上部に、第１電極１６と有機発光層１８と第２電極２０とが備えられる。 FIG. 1 is a schematic view illustrating a configuration of a conventional organic electroluminescent device.
As shown in the drawing, the organic electroluminescent device 10 includes a thin film transistor array unit 14 on a transparent first substrate 12. A first electrode 16, an organic light emitting layer 18, and a first electrode 16 are formed on the thin film transistor array unit 14. Two electrodes 20 are provided.

前記発光層１８は、赤(Ｒ)、緑(Ｇ)，青(Ｂ)のカラーを表現するが、一般的な方法としては、前記各画素Ｐごとに赤、緑、青のカラーを発光する別個の有機物質をパターニングして使用する。   The light emitting layer 18 expresses red (R), green (G), and blue (B) colors. As a general method, each pixel P emits red, green, and blue colors. A separate organic material is used by patterning.

前記第１基板１２と、吸湿剤２２が付着された第２基板２８とが、シーラント２６を介して合着されることで、カプセル化した有機電界発光素子１０が完成される。   The first substrate 12 and the second substrate 28 to which the hygroscopic agent 22 is attached are bonded together via a sealant 26, whereby the encapsulated organic electroluminescent device 10 is completed.

前記吸湿剤２２は、カプセル内部に浸透しうる水分と酸素を除去するためのものであり、基板２８の一部をエッチングし、エッチングされた部分に吸湿剤２２を詰めて、テープ２５で固定する。   The moisture absorbent 22 is used to remove moisture and oxygen that can penetrate into the capsule, and a part of the substrate 28 is etched, and the etched part is filled with the moisture absorbent 22 and fixed with the tape 25. .

以下、図２を参照して、有機電界発光素子の一画素に対応するアレイ部を概略的に説明する。
図２は、従来の有機電界発光素子に含まれる薄膜トランジスタアレイ部を概略的に図示した平面図である。
一般に、アクティブマトリックスタイプ薄膜トランジスタアレイ部は、基板１２に定義された多数の画素ごとに、スイッチング薄膜トランジスタＴＳと駆動薄膜トランジスタＴＤとストレージキャパシタ(storage capacitor)ＣＳＴとが備えられ、動作の特性によって、前記スイッチング薄膜トランジスタＴＳまたは駆動薄膜トランジスタＴＤは、それぞれ一つ以上の薄膜トランジスタの組合せで構成できる。 Hereinafter, an array unit corresponding to one pixel of the organic electroluminescent element will be schematically described with reference to FIG.
FIG. 2 is a plan view schematically illustrating a thin film transistor array part included in a conventional organic electroluminescent device.
In general, an active matrix type thin film transistor array, for each plurality of pixels defined in the substrate 12, the switching thin film transistor T S and the driving thin film transistor T D and the storage capacitor (storage capacitor) C ST and is provided, the characteristics of the operation, the switching thin film transistor T S or driving thin film transistor T D, respectively can be a combination of one or more thin film transistors.

前記基板１２は、透明な絶縁基板を使用し、その材質としては、ガラスやプラスチックなどがある。図示したように、基板１２上に、互いに所定間隔離隔して一方向に形成されたゲート配線３２と、絶縁膜を介して前記ゲート配線３２と交差するデータ配線３４とが備えられる。同時に、前記データ配線３４と平行に離隔した位置に、一方向に電源配線３５が形成される。   The substrate 12 uses a transparent insulating substrate, and the material includes glass and plastic. As shown in the figure, a gate line 32 formed in one direction at a predetermined interval is provided on the substrate 12 and a data line 34 intersecting the gate line 32 with an insulating film interposed therebetween. At the same time, power supply lines 35 are formed in one direction at positions spaced in parallel with the data lines 34.

前記スイッチング薄膜トランジスタＴＳと駆動薄膜トランジスタＴＤとして、それぞれゲート電極３６、３８とアクティブ層４０、４２とソース電極４６、４８及びドレイン電極５０、５２を含む薄膜トランジスタが使用される。 Examples switching TFT T S and the driving thin film transistor T D, the thin film transistors each including a gate electrode 36, 38 and the active layer 40 and the source electrode 46 and drain electrode 50, 52 is used.

前述した構成で、前記スイッチング薄膜トランジスタＴＳのゲート電極３６は前記ゲート配線３２と連結され、前記ソース電極４６は前記データ配線３４と連結される。前記スイッチング薄膜トランジスタＴＳのドレイン電極５０は、前記駆動薄膜トランジスタＴＤのゲート電極３８と、コンタクトホール５４を通して連結される。 In the above-described structure, the gate electrode 36 of the switching thin film transistor T S is connected to the gate wiring 32, the source electrode 46 is connected to the data line 34. The drain electrode 50 of the switching thin film transistor T S includes a gate electrode 38 of the driving thin film transistor T D, is connected through a contact hole 54.

前記駆動薄膜トランジスタＴＤのソース電極４８は、前記電源配線３５とコンタクトホール５６を通して連結される。また、前記駆動薄膜トランジスタＴＤのドレイン電極５２は、画素部Ｐに形成された第１電極１６と接触する。さらに、前記電源配線３５と、その下部の多結晶シリコン層である第１電極１６とは、絶縁膜を介して重なって、ストレージキャパシタＣＳＴを形成する。 The source electrode 48 of the driving thin film transistor T D is connected through the power supply wiring 35 and a contact hole 56. The drain electrode 52 of the driving thin film transistor T D is in contact with the first electrode 16 formed on the pixel portion P. Further, the power supply wiring 35 and the first electrode 16 which is a polycrystalline silicon layer below the power supply wiring 35 are overlapped via an insulating film to form a storage capacitor CST .

以下、図３を参照して、前記のように構成される有機電界発光素子の一画素の単位画素配置を説明する。
図３Ａ乃至図３Ｃを参照すると、前記単位画素は、ＲＧＢストライプ、ＲＧＢモザイク、そしてＲＧＢデルタなどの方式で配列される。 Hereinafter, a unit pixel arrangement of one pixel of the organic electroluminescence element configured as described above will be described with reference to FIG.
Referring to FIGS. 3A to 3C, the unit pixels are arranged in a manner such as an RGB stripe, an RGB mosaic, and an RGB delta.

前記ＲＧＢストライプ方式は、各列で単位画素がＲ，Ｇ、Ｂの順に配列され、ＲＧＢモザイク方式は、第１列では単位画素がＲ、Ｇ、Ｂの順に、第２列ではＧ、Ｂ、Ｒの順にで、第３列ではＢ、Ｒ、Ｇの順に反復配列される。そして、前記ＲＧＢデルタ方式は、Ｒ、Ｇ、Ｂ単位画素が偶数列で奇数列から一定の間隔外れて反復配列される構造を有する。   In the RGB stripe method, the unit pixels are arranged in the order of R, G, and B in each column. In the RGB mosaic method, the unit pixels are in the order of R, G, and B in the first column, and in the second column, G, B, and B, respectively. In the order of R, the third row is repeatedly arranged in the order of B, R, and G. The RGB delta method has a structure in which R, G, and B unit pixels are repeatedly arranged in an even number column at a predetermined distance from an odd number column.

このように配列された画素を見れば、各Ｒ、Ｇ、Ｂ単位画素は、ゲート配線方向を基準として全て水平方向よりは垂直方向に長く延長された形態を有し、このようなＲ、Ｇ、Ｂ単位画素が水平方向に配列されて一つの画素をなし、このような画素が反復配列された構造を有する。   Looking at the pixels arranged in this way, each R, G, B unit pixel has a form extending longer in the vertical direction than in the horizontal direction with reference to the gate wiring direction. , B unit pixels are arranged in the horizontal direction to form one pixel, and such a pixel is repeatedly arranged.

しかし、一般的な視覚情報の殆どは、垂直方向より水平方向に動きが多いので、前記のような単位画素構造を使用すれば、画像が不自然になるという問題点がある。
したがって、水平方向の動きが多い殆どの情報を画面上に表示する際、自然な画像を得るためには、それだけ解像度を上げなければならない問題点がある。 However, since most of the general visual information moves more in the horizontal direction than in the vertical direction, there is a problem in that the image becomes unnatural if the unit pixel structure as described above is used.
Therefore, there is a problem that the resolution must be increased by that much in order to obtain a natural image when displaying most information with a large amount of horizontal movement on the screen.

本発明は、自然な画像を提供する有機電界発光素子を提供することにその目的がある。   An object of the present invention is to provide an organic electroluminescent device that provides a natural image.

前記の目的を達成するために、本発明に係る有機電界発光素子は、基板上に互いに交差して、赤、緑、青の単位画素を定義するゲート配線及びデータ配線と、前記単位画素内に、ゲート電極、アクティブ層、ソース電極、及びドレイン電極を含む薄膜トランジスタで構成されたスイッチング素子及び駆動素子が形成された非発光領域と、前記単位画素内に、前記駆動素子のドレイン電極と接触する画素電極に形成された発光領域とを含んでなる有機電界発光素子において、前記赤、緑、青の単位画素の非発光領域のうち、少なくとも一つは、互いに異なる位置に形成されたことを特徴とする。   To achieve the above object, an organic electroluminescent device according to the present invention includes a gate line and a data line defining red, green, and blue unit pixels crossing each other on a substrate, and in the unit pixel. A non-light emitting region in which a switching element and a driving element composed of a thin film transistor including a gate electrode, an active layer, a source electrode, and a drain electrode are formed, and a pixel in contact with the drain electrode of the driving element in the unit pixel An organic electroluminescent device comprising a light emitting region formed on an electrode, wherein at least one of the non-light emitting regions of the red, green and blue unit pixels is formed at a different position. To do.

また、前記の目的を達成するための本発明に係る有機電界発光素子の製造方法は、基板上に垂直方向に配置された赤、緑、青の単位画素を定義する段階と、前記赤、緑、青の単位画素のうち、少なくとも二つの単位画素内の互いに異なる非発光領域にスイッチング素子とこれに連結された駆動素子を形成する段階と、前記各単位画素に前記駆動素子のドレイン電極と接触する画素電極を形成する段階と、前記画素電極の発光領域に有機発光層を形成する段階とを含んでなることを特徴とする。   The method for manufacturing an organic electroluminescent device according to the present invention for achieving the above object includes the steps of defining red, green, and blue unit pixels arranged in a vertical direction on a substrate; Forming a switching element and a driving element connected thereto in different non-light emitting areas of at least two unit pixels among the blue unit pixels, and contacting each unit pixel with a drain electrode of the driving element Forming a pixel electrode to be formed, and forming an organic light emitting layer in a light emitting region of the pixel electrode.

本発明によれば、赤、緑、青の単位画素の非発光領域を異ならせることで、光学的干渉を最小化して、画面に周期的に現れるブロックディム(block dim)現像を防止し、画質を改善することができ、自然な画像を提供する。   According to the present invention, the non-light emitting areas of the red, green, and blue unit pixels are made different, thereby minimizing optical interference and preventing block dim development that appears periodically on the screen. Providing natural images that can be improved.

以下、添付の図面を参照して、本発明に係る有機電界発光素子及びその製造方法について具体的に説明する。
図４は、本発明に係る一実施の形態であって、垂直配列ＲＧＢ駆動方式の有機電界発光素子で、画素構造を概略的に示す平面図である。
図４に図示されたように、垂直配列ＲＧＢ駆動方式の有機電界発光素子の画素Ｐは、ゲート配線方向を基準として垂直方向より水平方向に長く延長されたＲ、Ｇ、Ｂ単位画素ＳＰが垂直方向にストライプ状に配列された構造を有する。 Hereinafter, an organic electroluminescent device and a method for manufacturing the same according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 4 is a plan view schematically showing a pixel structure of an organic electroluminescence element of vertical array RGB driving method according to an embodiment of the present invention.
As shown in FIG. 4, the pixel P of the organic EL device of the vertical array RGB driving method has vertical R, G, and B unit pixels SP extended in the horizontal direction from the vertical direction with the gate wiring direction as a reference. It has a structure arranged in stripes in the direction.

そして、前記単位画素ＳＰは、発光領域Ｅと非発光領域Ｘとからなり、前記発光領域Ｅには、赤、緑、青のカラーを表示する有機物質がパターニングされて形成され、前記非発光領域Ｘには、スイッチング薄膜トランジスタ及び駆動薄膜トランジスタが形成されている。   The unit pixel SP includes a light emitting area E and a non-light emitting area X. The light emitting area E is formed by patterning an organic material that displays red, green, and blue colors. In X, a switching thin film transistor and a driving thin film transistor are formed.

Ｄ_１、Ｄ_２、Ｄ_３、Ｄ_４、．．．、Ｄ_ｍはデータ信号ライン(データ配線)１０２であり、データ配線１０２にデータ信号を供給するＤ−ＩＣ１８１が備えられている。Ｇ_Ｒ１、Ｇ_Ｒ２、Ｇ_Ｒ３、．．．、Ｇ_Ｒｎ、Ｇ_Ｇ１、Ｇ_Ｇ２、Ｇ_Ｇ３、......Ｇ_Ｇｎ、そしてＧ_Ｂ１、Ｇ_Ｂ２、Ｇ_Ｂ３、 ．．．、Ｇ_Ｂｎはそれぞれ赤、緑、青の単位画素に走査信号を供給するための走査ライン(ゲート配線)１０１を意味する。   D_1, D_2, D_3, D_4,. . . , D_m is a data signal line (data wiring) 102, and a D-IC 181 for supplying a data signal to the data wiring 102 is provided. G_R1, G_R2, G_R3,. . . , G_Rn, G_G1, G_G2, G_G3,... G_Gn, and G_B1, G_B2, G_B3,. . . , G_Bn mean scanning lines (gate wirings) 101 for supplying scanning signals to red, green, and blue unit pixels, respectively.

前記データ配線１０２(Ｄ_１、Ｄ_２、Ｄ_３、Ｄ_４、．．．、Ｄ_ｍ)は画素の一側に沿って配列され、前記データ配線１０２の一側には、スイッチング薄膜トランジスタ及び駆動薄膜トランジスタが形成されている。   The data lines 102 (D_1, D_2, D_3, D_4,..., D_m) are arranged along one side of the pixel, and a switching thin film transistor and a driving thin film transistor are formed on one side of the data line 102. .

本発明に係る垂直配列ＲＧＢ駆動方式有機電界発光素子は、ゲート配線方向を基準として垂直方向より水平方向に長い単位画素を垂直方向に配列しており、データ配線１０２を介して信号が印加される画素は、赤、緑、青の三つの単位画素に同時に印加されて、Ｄ-ＩＣ個数及びピン数を節減して、費用節減の効果がある。   The vertical array RGB driving organic electroluminescence device according to the present invention has unit pixels arranged in the vertical direction that are longer in the horizontal direction than the vertical direction with respect to the gate wiring direction, and a signal is applied through the data wiring 102. The pixels are simultaneously applied to the three unit pixels of red, green, and blue to reduce the number of D-ICs and the number of pins, thereby reducing the cost.

一方、前記非発光領域Ｘには、スイッチング薄膜トランジスタ及び駆動薄膜トランジスタが形成されており、このような非発光領域Ｘは、画素領域内に多数の薄膜トランジスタを含み、パワーラインが延長されているので、画素領域内に占めている面積が大きい。   On the other hand, a switching thin film transistor and a driving thin film transistor are formed in the non-light emitting region X. Since the non-light emitting region X includes a plurality of thin film transistors in the pixel region and the power line is extended, The area occupied in the area is large.

したがって、各単位画素ＳＰで、前記非発光領域Ｘが対称的で且つ規則的に配列される場合に発生しうる画質低下の要因を除去するために、本発明では、各単位画素で非発光領域Ｘを非対称且つ不規則に配置する。   Therefore, in order to remove the factor of image quality degradation that may occur when the non-light emitting areas X are symmetrically and regularly arranged in each unit pixel SP, in the present invention, in each unit pixel, the non-light emitting area Place X asymmetrically and irregularly.

前記画素で各単位画素ＳＰの非発光領域Ｘは、赤色単位画素で下端部右側に形成される場合には、垂直方向に隣接する緑色単位画素で前記非発光領域Ｘが下端部左側に形成され、垂直方向に隣接する青色単位画素で前記非発光領域Ｘが下端部右側に形成されるようにする。   When the non-light emitting area X of each unit pixel SP in the pixel is formed on the lower right side of the red unit pixel, the non-light emitting area X is formed on the lower left side of the green unit pixel adjacent in the vertical direction. The non-light emitting region X is formed on the right side of the lower end portion of the blue unit pixels adjacent in the vertical direction.

このように、有機電界発光素子の垂直配列ＲＧＢ画素構造の配置は、非対称に形成する。   As described above, the arrangement of the vertically arranged RGB pixel structures of the organic electroluminescent elements is formed asymmetrically.

図５は、図４に図示した有機電界発光素子の一画素で、非発光部に形成された駆動素子を示す回路図である。
図示されたように、有機電界発光素子の一画素は、スイッチング薄膜トランジスタ１０４、駆動薄膜トランジスタ１０５、ストレージキャパシタ１０６、及び発光ダイオード１０７からなる。 FIG. 5 is a circuit diagram illustrating a driving element formed in a non-light emitting portion of one pixel of the organic electroluminescent element illustrated in FIG.
As shown in the drawing, one pixel of the organic electroluminescent element includes a switching thin film transistor 104, a driving thin film transistor 105, a storage capacitor 106, and a light emitting diode 107.

ここで、スイッチング薄膜トランジスタ１０４のゲート電極は、ゲート配線１０１と連結され、ソース電極はデータ配線１０２と連結されている。前記スイッチング薄膜トランジスタ１０４のドレイン電極は、駆動薄膜トランジスタ１０５のゲート電極と連結されており、駆動薄膜トランジスタ１０５のドレイン電極は、発光ダイオード１０７のアノード電極と連結されている。   Here, the gate electrode of the switching thin film transistor 104 is connected to the gate wiring 101, and the source electrode is connected to the data wiring 102. The drain electrode of the switching thin film transistor 104 is connected to the gate electrode of the driving thin film transistor 105, and the drain electrode of the driving thin film transistor 105 is connected to the anode electrode of the light emitting diode 107.

前記駆動薄膜トランジスタ１０５のソース電極は、パワーライン１０３と連結されており、発光ダイオード１０７のカソード電極は接地されている。そして、ストレージキャパシタ１０６が、駆動薄膜トランジスタ１０５のゲート電極及びソース電極と連結されている。   The source electrode of the driving thin film transistor 105 is connected to the power line 103, and the cathode electrode of the light emitting diode 107 is grounded. The storage capacitor 106 is connected to the gate electrode and the source electrode of the driving thin film transistor 105.

したがって、ゲート配線１０１を介して信号が印加されると、スイッチング薄膜トランジスタ１０４がオンされ、データ配線１０２からの画像信号がスイッチング薄膜トランジスタ１０４を介してストレージキャパシタ１０６に格納される。この画像信号は、駆動薄膜トランジスタ１０５のゲート電極に伝達されて、駆動薄膜トランジスタ１０５を作動させて、発光ダイオード１０７を介して光が出力されるが、このとき、発光ダイオード１０７に流れる電流を制御することにより輝度を調節する。   Therefore, when a signal is applied through the gate wiring 101, the switching thin film transistor 104 is turned on, and an image signal from the data wiring 102 is stored in the storage capacitor 106 through the switching thin film transistor 104. This image signal is transmitted to the gate electrode of the driving thin film transistor 105 to operate the driving thin film transistor 105, and light is output through the light emitting diode 107. At this time, the current flowing through the light emitting diode 107 is controlled. To adjust the brightness.

ここで、スイッチング薄膜トランジスタ１０４がオフされても、ストレージキャパシタ１０６に格納された電圧値により駆動薄膜トランジスタ１０５を駆動するので、次の画面の画像信号が入るまで、継続的に電流が発光ダイオード１０７に流れて光を発するようになる。   Here, even if the switching thin film transistor 104 is turned off, the driving thin film transistor 105 is driven by the voltage value stored in the storage capacitor 106, so that current flows continuously to the light emitting diode 107 until the next screen image signal is input. To emit light.

このように構成される有機電界発光素子の非発光部は、単位画素内で多様な位置に形成することができる。   The non-light emitting portion of the organic electroluminescent element configured as described above can be formed at various positions in the unit pixel.

図６Ａ乃至図６Ｃは、本発明に係る有機電界発光素子の一画素の単位画素配置を示す図面である。
図６Ａ乃至図６Ｃを参照すると、垂直配列ＲＧＢ駆動方式の有機電界発光素子の単位画素は、垂直方向より水平方向に長く延長されたＲ、Ｇ、Ｂ単位画素が、垂直方向に、ストライプ状に配列された構造を有する。 6A to 6C are diagrams illustrating a unit pixel arrangement of one pixel of the organic electroluminescence device according to the present invention.
Referring to FIGS. 6A to 6C, the unit pixel of the organic EL device of the vertical array RGB driving method has R, G, and B unit pixels extended in the horizontal direction longer than the vertical direction, and the vertical direction is striped. It has an ordered structure.

そして、前記単位画素は、発光領域と非発光領域とからなり、前記発光領域には、赤、緑、青のカラーを表示する有機物質がパターニングされて形成され、前記非発光領域には、スイッチング及び駆動薄膜トランジスタが形成されている。   The unit pixel includes a light-emitting region and a non-light-emitting region. The light-emitting region is formed by patterning an organic material that displays red, green, and blue colors. And a driving thin film transistor is formed.

図６Ａに図示されたように、前記非発光領域が、赤、緑、青の単位画素で、それぞれ右側、中央、左側に形成されている。また、図６Ｂ及び図６Ｃに図示されたように、三つの単位画素のうち少なくとも一つの単位画素は、別の側面に形成されている。   As shown in FIG. 6A, the non-light-emitting areas are red, green, and blue unit pixels, which are formed on the right side, the center, and the left side, respectively. In addition, as illustrated in FIGS. 6B and 6C, at least one unit pixel among the three unit pixels is formed on another side surface.

したがって、前記のように非発光領域の配置を不規則に形成することにより、光学的干渉を最少化して、画面に周期的に現れるブロックディム(block dim)現像のような画質低下問題を防止することができる。   Accordingly, by irregularly arranging the non-light emitting regions as described above, optical interference is minimized and image quality degradation problems such as block dim development that appears periodically on the screen are prevented. be able to.

以上のように、本発明に係る垂直配列ＲＧＢ駆動方式有機電界発光素子は、垂直方向より水平方向に長い単位画素を垂直方向に配列しており、データ配線を介して信号が印加される画素は、赤、緑、青の三つの単位画素に信号が同時に印加されるので、Ｄ-ＩＣ個数及びピン数を節減して、費用節減の効果がある。   As described above, the vertical array RGB driving organic electroluminescence device according to the present invention has unit pixels arranged in the vertical direction that are longer in the horizontal direction than in the vertical direction, and the pixels to which signals are applied through the data lines are Since signals are simultaneously applied to the three unit pixels of red, green, and blue, the number of D-ICs and the number of pins can be reduced, thereby reducing the cost.

また、本発明は、一画素で非発光領域を不規則に配置して非発光領域を非対称構造で形成することにより、光学的干渉を最少化して、画面に周期的に現れるブロックディム(block dim)現像を防止し、画質を改善する効果がある。   The present invention also provides a block dim that periodically appears on the screen by minimizing optical interference by irregularly arranging non-light-emitting regions in one pixel and forming the non-light-emitting regions with an asymmetric structure. ) It has the effect of preventing development and improving image quality.

以上、本発明を具体的な実施の形態を通して詳細に説明したが、これは、本発明を具体的に説明するためのものであって、本発明に係る有機電界発光素子及びその製造方法はこれに限定されず、本発明の技術的思想内で当分野の通常の知識を有する者により、その変形や改良が可能であることが明白である。   As described above, the present invention has been described in detail through specific embodiments. However, this is for the purpose of specifically explaining the present invention, and the organic electroluminescent device and the method for manufacturing the same according to the present invention are described here. It is apparent that modifications and improvements can be made by those having ordinary knowledge in the art within the technical idea of the present invention.

従来の有機電界発光素子の構成を概略的に図示した図面である。1 is a diagram schematically illustrating a configuration of a conventional organic electroluminescence device. 従来の有機電界発光素子に含まれる薄膜トランジスタアレイ部を概略的に図示した平面図である。FIG. 6 is a plan view schematically illustrating a thin film transistor array part included in a conventional organic electroluminescence device. 従来の有機電界発光素子の一画素の単位画素配置を示す図面である。2 is a diagram illustrating a unit pixel arrangement of one pixel of a conventional organic electroluminescence device. 従来の有機電界発光素子の一画素の単位画素配置を示す図面である。2 is a diagram illustrating a unit pixel arrangement of one pixel of a conventional organic electroluminescence device. 従来の有機電界発光素子の一画素の単位画素配置を示す図面である。2 is a diagram illustrating a unit pixel arrangement of one pixel of a conventional organic electroluminescence device. 本発明に係る一実施の形態であって、垂直配列ＲＧＢ駆動方式の有機電界発光素子で、画素構造を概略的に示す平面図である。1 is a plan view schematically showing a pixel structure of an organic electroluminescent element of vertical array RGB driving method according to an embodiment of the present invention. 図４に図示した有機電界発光素子の一画素で、非発光部に形成された駆動素子を示す回路図である。FIG. 5 is a circuit diagram illustrating a driving element formed in a non-light-emitting portion of one pixel of the organic electroluminescence element illustrated in FIG. 4. 本発明に係る有機電界発光素子の一画素の単位画素配置を示す図面である。1 is a diagram illustrating a unit pixel arrangement of one pixel of an organic electroluminescence device according to the present invention. 本発明に係る有機電界発光素子の一画素の単位画素配置を示す図面である。1 is a diagram illustrating a unit pixel arrangement of one pixel of an organic electroluminescence device according to the present invention. 本発明に係る有機電界発光素子の一画素の単位画素配置を示す図面である。1 is a diagram illustrating a unit pixel arrangement of one pixel of an organic electroluminescence device according to the present invention.

Claims (12)

基板上に互いに交差して、赤、緑、青の単位画素を定義するゲート配線及びデータ配線と、
前記単位画素内に、ゲート電極、アクティブ層、ソース電極、及びドレイン電極とを含む薄膜トランジスタで構成されたスイッチング素子及び駆動素子が形成された非発光領域と、
前記単位画素内に、前記駆動素子のドレイン電極と接触する画素電極に形成された発光領域と
を含んでなる有機電界発光素子において、
前記赤、緑、青の単位画素の非発光領域のうち、少なくとも一つは、互いに異なる位置に形成されたことを特徴とする有機電界発光素子。 A gate line and a data line that intersect with each other on the substrate and define unit pixels of red, green, and blue; and
A non-light emitting region in which a switching element and a driving element composed of a thin film transistor including a gate electrode, an active layer, a source electrode, and a drain electrode are formed in the unit pixel;
In the organic electroluminescent device, the light emitting region formed in the pixel electrode in contact with the drain electrode of the driving element in the unit pixel,
At least one of the non-light emitting regions of the red, green, and blue unit pixels is formed at a different position. 前記駆動素子のソース電極と接触するように構成されたパワーラインをさらに含むことを特徴とする請求項１に記載の有機電界発光素子。   The organic electroluminescent device of claim 1, further comprising a power line configured to be in contact with a source electrode of the driving device. 隣接する単位画素の非発光領域は、互いに異なる位置に形成されたことを特徴とする請求項１に記載の有機電界発光素子。   The organic electroluminescence device according to claim 1, wherein the non-light emitting regions of adjacent unit pixels are formed at different positions. 前記赤、緑、青の単位画素のうち、少なくとも二つの単位画素は、互いに異なる位置に非発光領域を形成したことを特徴とする請求項１に記載の有機電界発光素子。   2. The organic electroluminescent device according to claim 1, wherein at least two unit pixels among the red, green, and blue unit pixels have non-light emitting regions formed at different positions. 前記単位画素は、ゲート配線方向を基準として垂直方向に配置されたことを特徴とする請求項１に記載の有機電界発光素子。   The organic electroluminescent device according to claim 1, wherein the unit pixels are arranged in a vertical direction with respect to a gate wiring direction. 前記単位画素は、ゲート配線方向を基準として垂直方向より水平方向が、より長く形成されたことを特徴とする請求項１に記載の有機電界発光素子。   The organic electroluminescence device according to claim 1, wherein the unit pixel is formed longer in the horizontal direction than in the vertical direction with reference to the gate wiring direction. 前記発光領域には、赤、緑、青の有機物質がパターニングされたことを特徴とする請求項１に記載の有機電界発光素子。   The organic electroluminescent device according to claim 1, wherein red, green and blue organic substances are patterned in the light emitting region. 基板上にゲート配線方向を基準として垂直方向に配置された赤、緑、青の単位画素を定義する段階と、
前記赤、緑、青の単位画素のうち、少なくとも二つの単位画素内の互いに異なる非発光領域にスイッチング素子とこれに連結された駆動素子を形成する段階と、
前記各単位画素に前記駆動素子のドレイン電極と接触する画素電極を形成する段階と、
前記画素電極の発光領域に有機発光層を形成する段階と
を含んでなることを特徴とする有機電界発光素子の製造方法。 Defining red, green, and blue unit pixels arranged in a vertical direction on the substrate with respect to the gate wiring direction;
Forming a switching element and a driving element connected thereto in different non-light emitting regions in at least two unit pixels of the red, green, and blue unit pixels;
Forming a pixel electrode in contact with the drain electrode of the driving element on each unit pixel;
Forming an organic light emitting layer in a light emitting region of the pixel electrode. A method of manufacturing an organic electroluminescent element, comprising: 隣接する単位画素の非発光領域は、互いに異なる位置に形成されたことを特徴とする請求項８に記載の有機電界発光素子の製造方法。   9. The method of manufacturing an organic electroluminescent device according to claim 8, wherein the non-light emitting areas of adjacent unit pixels are formed at different positions. 前記単位画素は、垂直方向より水平方向が、より長く形成されたことを特徴とする請求項８に記載の有機電界発光素子の製造方法。   The method of claim 8, wherein the unit pixel is formed longer in the horizontal direction than in the vertical direction. 前記赤、緑、青の単位画素のうち、少なくとも一つの単位画素は、互いに異なる位置に非発光領域を形成したことを特徴とする請求項８に記載の有機電界発光素子の製造方法。   The method according to claim 8, wherein at least one unit pixel among the red, green, and blue unit pixels has a non-light emitting region formed at a different position. 前記単位画素の非発光領域は、垂直方向にジグザグパターンを有することを特徴とする請求項８に記載の有機電界発光素子の製造方法。   The method according to claim 8, wherein the non-light-emitting region of the unit pixel has a zigzag pattern in a vertical direction.
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KR100683403B1 (en) 2007-02-15
TWI348676B (en) 2011-09-11
CN1917228A (en) 2007-02-21
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CN100470828C (en) 2009-03-18
FR2886461A1 (en) 2006-12-01

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